我国各玉米主产区 ,玉米播种至苗期常遭受干旱危害 ,对生产影响较大。选育耐旱玉米品种 ,是抵御旱害有效途径之一。耐旱性鉴定是耐旱玉米品种选育的关键技术。而在非干旱年份和地点 ,田间耐旱性鉴定非常困难。许多学者曾尝试测定离体叶片在室内干热条件下的保水力、相对电导率 The main maize producing areas in China, corn sown to seedling often suffer from drought damage, a greater impact on production. Breeding drought-tolerant corn varieties is one of the effective ways to resist drought. Identification of drought tolerance is the key technology for breeding drought-tolerant corn varieties. In non-arid years and locations, the identification of drought tolerance in the field is very difficult. Many scholars have tried to determine the detached leaves under dry and hot water conditions, the relative conductivity